We do have a light sensor available under the sensor category, and a new BMP280 based pressure sensor will be up on the website soon.
We tried a color sensor, but it doesn't work well in our format- the setup needs to be tailored to the application, so it's better to build in a breakout like the Adafruit board. We've thought about some sort of remote board setup, but haven't gotten to it yet.
It's definitely easy to solder an IR LED to our proto board.
